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Old 16th March 2013, 10:51 PM   #1991
WalterW is offline WalterW  Netherlands
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Warm is good.....hot is bad.

I'll just try.
If it's getting too hot, I will make an U-shaped profile for more cooling. Which also shields the transformers...hmmm nice...
must get some sleep now... thanks everybody.
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Old 17th March 2013, 09:07 AM   #1992
omishra is offline omishra  India
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I have built two discret bridges per channel using on semiconductor's mur3020wt diodes. They are slightly warmer side with bias of 0.6A/ device. Used small heatsink. As per datasheet it dissipates 1W for 2A forward current. Here diodes are conducting less than ampere per cycle, so dissipation is less than 0.4W / diode.

Last edited by omishra; 17th March 2013 at 09:10 AM.
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Old 17th March 2013, 12:51 PM   #1993
jacco vermeulen is offline jacco vermeulen  Netherlands
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Very wrong also.

At 50/60Hz mains, the caps are charged 100/120 times a second.
But each charge period does not last 1/100th or 1/120th of a second.

Charge current will only flow when charging voltage exceeds cap voltage level.
So only a tiny portion of the sinus slope is available for restocking the lytics.

If you calculate the ripple level for the smoothing cap number per rail and the bias level you have chosen, the lowest rail voltage level follows.

The sinus slope then tells at which point the diodes start conducting, from there till the sinus peak and back is the charging period.

Average charge current x charge period x 100 (or 120) ~ bias level (remember : VxI = VA ~ W = Joule per second)

For the MUR3020 : 1A x 0.6Vf x 1s < 10A x 0.92Vf x 0.1s
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Old 17th March 2013, 12:56 PM   #1994
Zen Mod is online now Zen Mod  Serbia
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it will be warm

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Old 17th March 2013, 01:02 PM   #1995
WalterW is offline WalterW  Netherlands
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Quote:
Originally Posted by Zen Mod View Post
it will be warm

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Old 17th March 2013, 01:05 PM   #1996
jacco vermeulen is offline jacco vermeulen  Netherlands
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Quote:
Originally Posted by Zen Mod View Post
it will be warm
Me idiot, when the sun shines and it's warm, I believe it's summer. (half the time)
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Old 17th March 2013, 01:57 PM   #1997
WalterW is offline WalterW  Netherlands
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ah now I get it: 0,6 J/s is smaller then 0,92J/s
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Old 25th March 2013, 10:45 PM   #1998
sts9fan is offline sts9fan  United States
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Soon?
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Old 1st April 2013, 11:28 AM   #1999
Rixsta is offline Rixsta  United Kingdom
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haha Im waiting too, am patient though will hold of buying from elsewhere and build the rest for now.
Cheers!
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Old 1st April 2013, 01:23 PM   #2000
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